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Definition

Quadratic Inequality

A quadratic inequality is an inequality that contains a quadratic expression. The standard form of a quadratic inequality is written in one of the following forms, where aa, bb, and cc are real numbers and aeq0a eq 0: ax2+bx+c<0ax^2 + bx + c < 0, ax2+bx+c0ax^2 + bx + c \leq 0, ax2+bx+c>0ax^2 + bx + c > 0, or ax2+bx+c0ax^2 + bx + c \geq 0. It can be formed by replacing the equal sign in the standard form of a quadratic equation with an inequality symbol.

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Updated 2026-05-25

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Ch.9 Quadratic Equations and Functions - Intermediate Algebra @ OpenStax

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